test: reorganize test structure and add missing unit tests

Reorganize flat tests/ directory to mirror source code structure
(tools/, gateway/, hermes_cli/, integration/). Add 11 new test files
covering previously untested modules: registry, patch_parser,
fuzzy_match, todo_tool, approval, file_tools, gateway session/config/
delivery, and hermes_cli config/models. Total: 147 unit tests passing,
9 integration tests gated behind pytest marker.

tests/hermes_cli/test_models.py

@@ -0,0 +1,33 @@
+"""Tests for the hermes_cli models module."""
+
+from hermes_cli.models import OPENROUTER_MODELS, menu_labels, model_ids
+
+
+class TestModelIds:
+    def test_returns_strings(self):
+        ids = model_ids()
+        assert isinstance(ids, list)
+        assert len(ids) > 0
+        assert all(isinstance(mid, str) for mid in ids)
+
+    def test_ids_match_models_list(self):
+        ids = model_ids()
+        expected = [mid for mid, _ in OPENROUTER_MODELS]
+        assert ids == expected
+
+
+class TestMenuLabels:
+    def test_same_length_as_model_ids(self):
+        labels = menu_labels()
+        ids = model_ids()
+        assert len(labels) == len(ids)
+
+    def test_recommended_in_first(self):
+        labels = menu_labels()
+        assert "recommended" in labels[0].lower()
+
+    def test_labels_contain_model_ids(self):
+        labels = menu_labels()
+        ids = model_ids()
+        for label, mid in zip(labels, ids):
+            assert mid in label